All my friends who work with bands or in churches with live audio will appreciate this. Check out the GaffGun. It tapes down audio, video, and electrical cords in seconds. Gaffing tape is durable and it doesn’t leave a residue, so it works great to tape down cords.  I can think of a lot of times where this would have worked great. It’s not cheap, but it is worth it if you do this often.  Check out the video below and then head over to their website to find out more.